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Comparison of three methods of fractal analysis applied to soot [An article from: Journal of Aerosol Science]
Description
This digital document is a journal article from Journal of Aerosol Science, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The morphological and dynamic properties of fractal-like particles produced from the combustion of wood are studied in this work. Particles with electrical mobility diameters of 200, 275, 350 and 450nm were deposited on filters and imaged using a high-resolution scanning electron microscope (SEM). The soot particles consisted of aggregated primary spheres with mean radius a"p=25.5+/-3.5nm and standard deviation @s"g=1.27+/-0.09. The fractal dimension of the aggregates, D"f, was derived from three techniques: (1)D"f=1.84+/-0.05 from the projected surfaces in the SEM images; (2)D"f=1.83+/-0.05 from the relationship between number of primary particles per aggregate N, and radius of gyration R"g; (3)D"f=1.80+/-0.13 from the relationship of mobility and N. Thus, there is agreement between the three techniques with an average D"f of 1.83. The dynamic shape factors of the soot particles were between 1.5 and 2.5 and increasing with N. In the regime 0.2
Description:
The morphological and dynamic properties of fractal-like particles produced from the combustion of wood are studied in this work. Particles with electrical mobility diameters of 200, 275, 350 and 450nm were deposited on filters and imaged using a high-resolution scanning electron microscope (SEM). The soot particles consisted of aggregated primary spheres with mean radius a"p=25.5+/-3.5nm and standard deviation @s"g=1.27+/-0.09. The fractal dimension of the aggregates, D"f, was derived from three techniques: (1)D"f=1.84+/-0.05 from the projected surfaces in the SEM images; (2)D"f=1.83+/-0.05 from the relationship between number of primary particles per aggregate N, and radius of gyration R"g; (3)D"f=1.80+/-0.13 from the relationship of mobility and N. Thus, there is agreement between the three techniques with an average D"f of 1.83. The dynamic shape factors of the soot particles were between 1.5 and 2.5 and increasing with N. In the regime 0.2
